Friedrich Thermostat RT6 User Manual

To Install Thermostat  
ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse  
or switching the appropriate circuit breaker to the OFF position before removing the existing  
thermostat.  
RT6  
Electronic Thermostat  
IMPORTANT: Thermostat installation must conform to local and national building and electrical codes and  
ordinances.  
Note: Mount the thermostat about five feet above the floor. Do not mount the thermostat on an outside wall, in  
direct sunlight, behind a door, or in an area affected by a vent or duct.  
• 1-Stage Heat/1-Stage Cool Systems  
1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit  
breaker off.  
• Configurable to: 2-stage heat pump  
• Large Display With Backlight  
2. To remove cover, pull gently at the seam at the top.  
3. Put thermostat base against the wall where you plan to mount it (Be sure wires will feed through the wire  
opening in the base of the thermostat).  
• Selectable Fahrenheit or Celsius  
4. Mark the placement of the mounting holes.  
5. Set thermostat base and cover away from working area.  
6. Using a 3/16” drill bit, drill holes in the places you have marked for mounting.  
7. Use a hammer to tap supplied anchors in mounting holes.  
8. Align thermostat base with mounting holes and feed the control wires through slit in thermal intrusion barrier and  
into wire opening.  
9. Use supplied screws to mount thermostat base to wall.  
10. Insert stripped, labeled wires in matching wire terminals.  
CAUTION!: Be sure exposed portion of wires does not touch other wires.  
Installation, Operation & Application Guide  
11. Gently tug wire to be sure of proper connection. Double check that each wire is connected to the proper  
terminal.  
12. Turn on power to the system at the main service panel.  
13. Configure thermostat to match the type of system you have.  
14. Replace cover on thermostat by snapping it in place.  
15. Test thermostat operation as described in “Testing the Thermostat”.  
Parts Diagram  
Wiring Diagrams  
Heat/Cool Systems  
Heat pump with electric backup  
Up button  
Transformer  
Transformer  
Down button  
R
R
120  
VAC  
120  
24 VAC  
24 VAC  
VAC  
C
C
Low Fan  
High Fan  
GL  
GH  
O/B  
Y
Low Fan  
GL  
GH  
O/B  
Y
High Fan  
Reversing Valve  
Compressor  
R
C
GL GH O/B  
Y
W
Right (fan)  
button  
Cool  
Heat  
RESET CONFIG  
Auxiliary Heat  
W
W
Left (system)  
button  
Reset  
switch  
Configuration  
switch  
Lo/Hi fan  
switch  
Terminal Designator Descriptions  
R – 24 VAC hot  
C – 24 VAC common  
O/B – Configurable  
Icon Descriptions  
O – Cool active reversing valve (Freidrich PTHP)  
B – Heat active reversing valve (Freidrich Vert-I-Pak, Kuhl+HP)  
Y – 1st stage cool, 1st stage heat for heat pumps  
W – 1st stage heat for non-heat pump systems, auxiliary heat for HP systems  
GL – Low fan  
Room temperature  
offset activated  
Fan operation icon  
Cooling operation icon  
Heating operation icon  
COOL  
HEAT  
GH – High fan  
Heat set point when blinking  
Cool set point when blinking  
RT6 Output Chart  
1ST Cool  
1ST Heat  
W, G, B  
Y, G  
2ND Heat  
N/A  
Configuration  
Heat/Cool and single stage HP models  
PDH (PTHP) models only  
ELC  
Y, G  
HP ‘O’ Config  
Y, G, O  
Y, W, G  
Specifications  
The RT6 thermostat is configurable for different systems. The configuration directly affects the outputs.  
Electrical rating: • 24 VAC (18-30 VAC)  
Use the output chart to correctly configure and wire the thermostat to your system.  
• 1 amp maximum per terminal  
• 3 amp maximum total load  
Temperature control range: 45°F to 90°F (7°C to 32°C) Accuracy: ± 1°F (± 0.5°C)  
System configurations: 2-stage heat, 1-stage cool, heat pump, electric  
Configuration Mode  
Timing: Anti-short Cycle: 4 minutes (bypass anti-short cycle delay by returning to OFF mode for 5 seconds)  
Backlight Operation: 10 seconds  
The configuration mode is used to set the RT6 to match your heating/cooling system. The RT6 functions with heat  
pump, air conditioning, or electric heat systems.  
Terminations: R, C, GL, GH, O/B, Y, W  
Note: Thermostat comes configured for 1-stage heat / 1-stage cooling for use with all heat/cool and single-stage heat  
pump models.For Friedrich PTHP models follow the instructions below to configure the thermostat for two-stage  
heat pump operation using the ‘O’ terminal.  
To configure the RT6, perform the following steps:  
Important Safety Information  
WARNING!: Always turn off power at the main power supply before installing, cleaning, or removing  
1. Verify the RT6 is in the OFF mode.  
thermostat.  
Press the SYS (left) button until off mode displays.  
• This thermostat is for 24 VAC applications only; do not use on voltages over 30 VAC  
• All wiring must conform to local and national electrical and building codes  
• Do not use air conditioning when the outdoor temperature is below 50 degrees; this can damage your A/C system  
and cause personal injuries  
2. Remove the cover of the thermostat by gently pulling near one of the corners at  
OFF  
the top of the thermostat.  
• Use this thermostat only as described in this manual  
3. Press the CONFIG button for 1 second while the RT6 is in OFF mode.  
CONFIG  
Package Contents/Tools Required  
Package includes: RT6 thermostat on base, thermostat cover, wiring labels, screws and wall anchors, Installation,  
Operation and Application Guide  
Press the up or down button to change settings within each screen.  
Up  
button  
Tools required for installation: Drill with 3/16” bit, hammer, screwdriver  
Down  
button  
Press the right button to advance to the next screen.  
To Remove Existing Thermostat  
ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse  
or switching the appropriate circuit breaker to the OFF position before removing the existing  
thermostat.  
Note: Pressing the left button will return you to the previous screen.  
Left  
button  
Right  
button  
To exit configuration mode, press the CONFIG switch for 1 second.  
1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit  
breaker off.  
2. Remove cover of old thermostat. This should expose the wires.  
3. Label the existing wires with the enclosed wire labels before removing wires.  
4. After labeling wires, remove wires from wire terminals.  
5. Remove existing thermostat base from wall.  
6. Refer to the following section for instructions on how to install this thermostat.  
 

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